Ventilator



R. S. CLARK.

VENTILATOR. APPLICATION FILED AUG-22.1921.

Patented Nov. 28, 1922.

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Patented Nov. 28,1922.

BEN S. CLARK, OF CHICAGO, ILLINOIS, ASSIGNOR TO HUNTER CLARK VENTILATING SYATEM COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

VENTILATOR.

Application filed August 22, 1921.

I To all whom it may concern:

Be it .known that I, REN S. CLARK, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Ventilator, of which the following is a specification. 4

This invention relates to ventilators and relates particularly to ventilators especially designed and particularly adapted for ventilating theatres and other auditoriums and which comprise base portions consisting of thimbles secured in holes in the fl0or, usually beneath the seats, and are connected by pipes or fiues with a fan or other source of supply of air, and said ventilators also comprising a cap haw'ng depending flanges at their edgesv and which are adjustably mounted on the base portions of said ventilators so as to be adjustable towards and from the same, in order to vary the size of the free spaces or openings between the depending edges of said flanges and the thimbles.

The object of the invention is to provide improved means for supporting the cap upon the base portion of the ventilator, which will alford a rigid support for said cap under all conditions of use and which are so positioned that they will leave practically unobstructed discharge space or opening between the base and cap of the ventilator.

To effect the foregoing object, the cap supporting means of my improved ventilator consist of a spider, preferably formed integral with the base portion ofthe ventilator and spaced cams formed within the cap of the ventilatonbetween the center and the circumference thereof. To afiord a stable support for said cap, there are at least three of said cams, said cams beingsimilar and being arranged at angles of substantially 120 from each other with reference to the center of the ventilator. Said cams are pro-' videdwith similar inclined surfaces which extend atangles to the surface of the cap on which they arecformed and are ada t-. ed to rest on corresponding symmetrica 1y arranged lugs or projections formed in proper positions on the arms of the supporting spider, said cap being held in adjusted positions, corresponding to an air discharge opening of desired size, by means of serrations or notches formed on said cam surfaces with which the lugs or projections on said spider are adapted, to interlock, the

Serial No. 494,204.

edges of said lugs or projections upon which said cam surfaces rest being fitted to the serrations 0r notches therein.

My invention also comprises the various other features and details of construction hereinafter described and claimed.

In the accompanying drawing, in which my invention is fully illustrated,

Figure 1 is a top plan view of a ventilator embodying my inventionfshown as attached to a floor.

Figure 2 is a bottom plan view of said.

ventilator.

Figure 3 is an enlarged sectional view of pj he ventilator taken on the line 3-3 of igure 4 is an enlarged fragmentary top plan view of the central portion of the spider forming part of the base portion of the ventilator, showing the lugs on which the cap of the ventilator rests directly, and

Figure 5 is a fragmentary sectional detail view on the line 55 of Fig. 4.

Referring now to the drawings, A desig-' nates, as awhole, the base portion of my improved ventilator, and B the cap thereof, .both of which, as regards their usual fearigidly secured thereto. Also, thecap oomprises a plate 3, having a depending flange 4 at its outer edge.

As shown, said'base A and cap B are circular, but the shape thereof may be variously changed without departing from my invention.

- In accordance with my invention, the cap or hood B is supported upon the base A in the following manner :-Formed on the base A is a spider a comprising a hub 5 which is connected with thethimble l of the base by arms 6, said hub 5 being positioned above the plane of the top of the base A and the spider arms 6 being corresponding inclined. The cap B is detachably connected to the base A by a screw (inserted through a hole formed centrally in said cap, the lower end of which has screw-threaded engagement with a hole formed in the hub 5 of the.

spider a, anut 8 being preferably cast into said hub in proper position for engagement by said screw 7. Said cap B is adjustably supported in spaced relation to the base A by means of lugs or projections 9 formed To efi'ect the object of the invention as it relates to providing a rigid support for the 'cap B, the supporting cams 10 and lugs or projections 9 are positioned at a distance rom the center of the ventilator'that is from the screw 7 which connects said cap to the base of the ventilator-and comprise at "least three sets of supporting cams and lugs, of projections arranged concentrically around the screw" 7 at substantially equal distances from one another.

'Also, to efiect the 'object'of the invention, as it relates to providing a substantially unobstructed air discharge space between the lower edge of the cap flange 4; and the top of the base portion A, the cams 10 are arranged wholly within the cap B. and at a distance inside of the depending flan e 4 of said cap, the spider arms 6 being pre erably inclined to the plane of the base portion, A of the ventilator, whereby .it is rendered ections', which embrace the outer sides of said cams.

1. In a ventilator of the type described the combination of a baseportion, a cap,

andmeans for adjustably mounting said cap on said base, comprising a spider on said base, a screw whlch extends through a hole in said cap and has threaded engagement with the hub of said spider, cams formed within said cap, said cams being provided with serrated surfaces adapted to engage seats formed on'said spider arms, substantially asdescribed.

, 2. A'ventilator as specified in claim 1, III which the cap, supporting seats onthe s ider arms are formed at the ends of lugs t ereon, substantially as described.

3. A ventilator as specified in claim 1, in which the can supporting cams are arranged intermediate the screw which 'connects the cap to the base and the marginal flange of said cap and at an appreciable distance from both said screw and flange, substantially as described.

a. A ventilator'as specified in "claim 1,-in which the spider arms are inwardly and upwardly inclined, substantially as described. j

5. A ventilator as specified in claim 1, in which the cap supporting' seats on the spider arms are shaped to fit the serrations in thecams onthe cap, substantially as-described.

In testimony that I claim the foregoing as my invention, I have hereunto aflixed my signature this th day of August, 1921.

.REN s. CLARK. 

